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deployer.go
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deployer.go
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package api
import (
"fmt"
"net/url"
"strconv"
"time"
"github.com/CloudCom/firego"
"github.com/airware/vili/config"
"github.com/airware/vili/docker"
"github.com/airware/vili/errors"
"github.com/airware/vili/kube"
"github.com/airware/vili/kube/extensions/v1beta1"
"github.com/airware/vili/log"
"github.com/airware/vili/redis"
"github.com/airware/vili/slack"
"github.com/airware/vili/templates"
)
const (
rolloutPatchTimeout = 10 * time.Second
rolloutPatchPollPeriod = 1 * time.Second
rolloutScaleTimeout = 3 * time.Minute
rolloutScalePollPeriod = 1 * time.Second
)
// deployer
type deployerSpec struct {
deployment *Deployment
db *firego.Firebase
// for all actions
fromReplicaSet *v1beta1.ReplicaSet
toReplicaSet *v1beta1.ReplicaSet
// for resume
deploymentTemplate templates.Template
variables map[string]string
lastPing time.Time
}
func makeDeployer(deployment *Deployment) (*deployerSpec, error) {
deployer := &deployerSpec{
deployment: deployment,
db: deploymentDB(deployment.Env, deployment.App, deployment.ID),
lastPing: time.Now(),
}
replicaSetList, _, err := kube.ReplicaSets.List(deployment.Env, &url.Values{
"labelSelector": []string{"app=" + deployment.App},
})
if err != nil {
return nil, err
}
if replicaSetList != nil {
for _, replicaSet := range replicaSetList.Items {
if string(replicaSet.ObjectMeta.UID) == deployment.FromUID {
fromReplicaSet := replicaSet
deployer.fromReplicaSet = &fromReplicaSet
}
if string(replicaSet.ObjectMeta.UID) == deployment.ToUID {
toReplicaSet := replicaSet
deployer.toReplicaSet = &toReplicaSet
}
}
}
if deployment.FromUID != "" && deployer.fromReplicaSet == nil && deployer.toReplicaSet == nil {
log.Warn("Could not find any replica sets for this deployment")
}
return deployer, nil
}
func (d *deployerSpec) addMessage(message, level string) error {
var logf func(...interface{})
switch level {
case "debug":
logf = log.Debug
case "info":
logf = log.Info
case "warn":
logf = log.Warn
case "error":
logf = log.Error
default:
return fmt.Errorf("Invalid level %s", level)
}
logf(message)
_, err := d.db.Child("log").Push(LogMessage{
Time: time.Now(),
Message: message,
Level: level,
})
if err != nil {
return err
}
if level != "debug" {
urlStr := fmt.Sprintf(
"%s/%s/apps/%s/deployments/%s",
config.GetString(config.URI),
d.deployment.Env,
d.deployment.App,
d.deployment.ID,
)
slackMessage := fmt.Sprintf(
"*%s* - *%s* - <%s|%s> - %s",
d.deployment.Env,
d.deployment.App,
urlStr,
d.deployment.ID,
message,
)
if level == "error" {
slackMessage += " <!channel>"
}
err := slack.PostLogMessage(slackMessage, level)
if err != nil {
return err
}
}
return nil
}
func (d *deployerSpec) resume() error {
log.Infof("Resuming deployment %s for app %s in env %s", d.deployment.ID, d.deployment.App, d.deployment.Env)
body, err := templates.Deployment(d.deployment.Env, d.deployment.Branch, d.deployment.App)
if err != nil {
return err
}
d.deploymentTemplate = body
deployment := &v1beta1.Deployment{}
err = d.deploymentTemplate.Parse(deployment)
if err != nil {
return err
}
deployment.Spec.Template.ObjectMeta.Labels["deployment"] = d.deployment.ID
imageName, err := docker.FullName(d.deployment.App, d.deployment.Branch, d.deployment.Tag)
if err != nil {
return err
}
deployment.Spec.Template.Spec.Containers[0].Image = imageName
if d.deployment.DesiredReplicas == 0 {
if d.fromReplicaSet != nil && d.fromReplicaSet.Spec.Replicas != nil {
d.deployment.DesiredReplicas = int(*d.fromReplicaSet.Spec.Replicas)
} else {
d.deployment.DesiredReplicas = int(*deployment.Spec.Replicas)
}
d.db.Child("desiredReplicas").Set(d.deployment.DesiredReplicas)
} else {
*deployment.Spec.Replicas = int32(d.deployment.DesiredReplicas)
}
if d.deployment.Rollout != nil {
deployment.Spec.Strategy.Type = v1beta1.DeploymentStrategyType(d.deployment.Rollout.Strategy)
if d.deployment.Rollout.Strategy != rolloutStrategyRollingUpdate {
deployment.Spec.Strategy.RollingUpdate = nil
}
}
// return any lock errors synchronously
if err := d.acquireLock(); err != nil {
return err
}
// if no problem fetching lock, run the rollout asynchronously
go func() {
defer d.releaseLock()
var state string
d.db.Child("state").Value(&state)
var message string
switch state {
case deploymentStateNew:
message = fmt.Sprintf("Starting deployment created by *%s* for tag *%s* on branch *%s*", d.deployment.Username, d.deployment.Tag, d.deployment.Branch)
case deploymentStatePaused:
message = "Resuming deployment"
default:
log.Errorf("Cannot resume deployment from state %s", state)
return
}
d.db.Child("state").Set(deploymentStateRunning)
d.deployment.State = deploymentStateRunning
d.addMessage(message, "info")
// fetch the latest pods for the fromReplicaSet
if d.fromReplicaSet != nil {
if _, _, err := d.refreshReplicaSetPodCount(d.fromReplicaSet); err != nil {
log.Error(err)
return
}
}
newDeployment, _, err := kube.Deployments.Replace(d.deployment.Env, d.deployment.App, deployment)
if err != nil {
log.Error(err)
return
}
if newDeployment == nil {
newDeployment, _, err = kube.Deployments.Create(d.deployment.Env, deployment)
if err != nil {
log.Error(err)
return
}
}
// It can take some time for kubernetes to populate the revision annotation
for {
if _, ok := newDeployment.ObjectMeta.Annotations["deployment.kubernetes.io/revision"]; ok {
break
}
time.Sleep(100 * time.Millisecond)
newDeployment, _, err = kube.Deployments.Get(d.deployment.Env, d.deployment.App)
if err != nil {
log.Error(err)
return
}
}
replicaSetList, _, err := kube.ReplicaSets.ListForDeployment(d.deployment.Env, newDeployment)
if err != nil {
log.Error(err)
return
}
newRevision, ok := newDeployment.ObjectMeta.Annotations["deployment.kubernetes.io/revision"]
if !ok {
log.Error("No revision annotation found on the new deployment")
return
}
var toReplicaSet *v1beta1.ReplicaSet
if replicaSetList != nil {
for _, replicaSet := range replicaSetList.Items {
revision := replicaSet.ObjectMeta.Annotations["deployment.kubernetes.io/revision"]
if revision == newRevision {
toReplicaSet = &replicaSet
break
}
}
}
if toReplicaSet == nil {
log.Error("Unable to find new replica set")
return
}
if d.toReplicaSet == nil || d.toReplicaSet.ObjectMeta.UID != toReplicaSet.ObjectMeta.UID {
d.addMessage(fmt.Sprintf("Created new replica set: %s", toReplicaSet.ObjectMeta.Name), "debug")
}
d.toReplicaSet = toReplicaSet
d.db.Child("toUid").Set(toReplicaSet.ObjectMeta.UID)
d.deployment.ToUID = string(toReplicaSet.ObjectMeta.UID)
stateNotifications := make(chan firego.Event)
stateRef := d.db.Child("state")
if err := stateRef.Watch(stateNotifications); err != nil {
log.Error(err)
return
}
defer stateRef.StopWatching()
go func() {
for event := range stateNotifications {
log.Debugf("Deployment state changed to %s", event.Data.(string))
d.deployment.State = event.Data.(string)
}
}()
rolloutErr := d.monitorRollout()
if rolloutErr != nil {
deployment, _, err := kube.Deployments.Get(d.deployment.Env, d.deployment.App)
if err != nil {
log.Error(err)
return
}
if deployment != nil {
deployment.Spec.Paused = true
_, _, err = kube.Deployments.Replace(d.deployment.Env, d.deployment.App, deployment)
if err != nil {
log.Error(err)
return
}
}
d.db.Child("state").Set(deploymentStatePaused)
switch e := rolloutErr.(type) {
case deployerPaused:
d.addMessage("Paused deployment", "warn")
case deployerAutoPaused:
// pass
case *deployerTimeout:
d.addMessage(e.message, "error")
default:
log.Error(rolloutErr)
}
}
}()
return nil
}
func (d *deployerSpec) pause() error {
log.Infof("Pausing deployment %s for app %s in env %s", d.deployment.ID, d.deployment.App, d.deployment.Env)
var state string
var newState string
d.db.Child("state").Value(&state)
var message string
switch state {
case deploymentStateRunning:
message = "Pausing deployment"
newState = deploymentStatePausing
case deploymentStatePausing:
message = "Force pausing deployment"
newState = deploymentStatePaused
default:
return errors.BadRequestError(fmt.Sprintf("Cannot pause deployment from state %s", state))
}
d.db.Child("state").Set(newState)
d.addMessage(message, "warn")
return nil
}
func (d *deployerSpec) rollback() error {
log.Infof("Rolling back deployment %s for app %s in env %s", d.deployment.ID, d.deployment.App, d.deployment.Env)
if err := d.acquireLock(); err != nil {
return err
}
defer d.releaseLock()
var state string
var newState string
d.db.Child("state").Value(&state)
var message string
switch state {
case deploymentStatePaused, deploymentStateCompleted:
message = "Rolling back deployment"
newState = deploymentStateRollingback
default:
return errors.BadRequestError(fmt.Sprintf("Cannot roll back deployment from state %s", state))
}
d.db.Child("state").Set(newState)
d.deployment.State = newState
d.addMessage(message, "warn")
deployment, _, err := kube.Deployments.Get(d.deployment.Env, d.deployment.App)
if err != nil {
return err
}
if deployment.Spec.Paused {
deployment.Spec.Paused = false
_, _, err := kube.Deployments.Replace(d.deployment.Env, d.deployment.App, deployment)
if err != nil {
return err
}
}
if d.fromReplicaSet != nil && d.toReplicaSet != nil {
fromRevision, ok := d.fromReplicaSet.ObjectMeta.Annotations["deployment.kubernetes.io/revision"]
if !ok {
return errors.New("Unable to determine previous deployment revision")
}
rollbackTo, err := strconv.ParseInt(fromRevision, 10, 0)
if err != nil {
return err
}
rollback := v1beta1.DeploymentRollback{
Name: d.deployment.App,
RollbackTo: v1beta1.RollbackConfig{
Revision: rollbackTo,
},
}
if _, _, err := kube.Deployments.Rollback(d.deployment.Env, d.deployment.App, &rollback); err != nil {
return err
}
} else {
log.Warn("Cannot roll back deployment with no from or to replica set")
}
d.db.Child("state").Set(deploymentStateRolledback)
d.addMessage("Rolled back deployment", "warn")
return nil
}
// utils
func (d *deployerSpec) monitorRollout() error {
for {
readyCount, runningCount, err := d.refreshReplicaSetPodCount(d.toReplicaSet)
if err != nil {
return err
}
fromRunningCount := 0
if d.fromReplicaSet != nil {
_, fromRunningCount, _ = d.refreshReplicaSetPodCount(d.fromReplicaSet)
}
log.Debugf("%s Replica Count: Ready: %v, Running: %v", d.deployment.App, readyCount, runningCount)
if readyCount == d.deployment.DesiredReplicas && fromRunningCount == 0 {
d.addMessage(fmt.Sprintf("Successfully completed rollout in %s", d.deployment.Clock.humanize()), "info")
d.db.Child("state").Set(deploymentStateCompleted)
return nil
}
if err := d.ping(); err != nil {
return err
}
time.Sleep(250 * time.Millisecond)
}
}
func (d *deployerSpec) acquireLock() error {
locked, err := redis.GetClient().SetNX(
fmt.Sprintf("deploymentlock:%s:%s", d.deployment.Env, d.deployment.App),
true,
1*time.Hour,
).Result()
if err != nil {
return err
}
if !locked {
return errors.ConflictError("Failed to acquire deployment lock")
}
log.Debugf("Acquired lock for %s in %s", d.deployment.App, d.deployment.Env)
WaitGroup.Add(1)
return nil
}
func (d *deployerSpec) releaseLock() {
WaitGroup.Done()
err := redis.GetClient().Del(
fmt.Sprintf("deploymentlock:%s:%s", d.deployment.Env, d.deployment.App),
).Err()
if err != nil {
log.Error(err)
} else {
log.Debugf("Released lock for %s in %s", d.deployment.App, d.deployment.Env)
}
}
// ping updates the deployment clock, and checks if the deployment should be paused
func (d *deployerSpec) ping() error {
now := time.Now()
elapsed := Clock(now.Sub(d.lastPing))
if d.deployment.Clock == nil {
d.deployment.Clock = &elapsed
} else {
*d.deployment.Clock += elapsed
}
d.lastPing = now
d.db.Child("clock").Set(d.deployment.Clock)
if d.deployment.State == deploymentStatePausing ||
d.deployment.State == deploymentStatePaused {
return deployerPaused{}
}
if Exiting {
log.Warn("Pausing deployment after server shutdown request")
return deployerPaused{}
}
return nil
}
func (d *deployerSpec) refreshReplicaSetPodCount(replicaSet *v1beta1.ReplicaSet) (int, int, error) {
kubePods, status, err := kube.Pods.ListForReplicaSet(d.deployment.Env, replicaSet)
if err != nil {
return 0, 0, err
}
if status != nil {
return 0, 0, fmt.Errorf("Could not fetch the list of pods for replica set %s", replicaSet.ObjectMeta.Name)
}
pods, readyCount, runningCount := getPodsFromPodList(kubePods)
if string(replicaSet.ObjectMeta.UID) == d.deployment.FromUID {
d.db.Child("fromPods").Set(pods)
} else if string(replicaSet.ObjectMeta.UID) == d.deployment.ToUID {
d.db.Child("toPods").Set(pods)
}
return readyCount, runningCount, nil
}
type deployerException struct {
}
func (e *deployerException) Error() string {
return "Deployer exception"
}
type deployerPaused struct {
*deployerException
}
type deployerAutoPaused struct {
*deployerException
}
type deployerTimeout struct {
message string
}
func (e *deployerTimeout) Error() string {
return e.message
}